[jira] [Created] (FREEMARKER-144) [freemarker-cli] Proof Of Concept for providing DataFrames

["Siegfried Goeschl (Jira)" <ji...@apache.org>]

Siegfried Goeschl created FREEMARKER-144:
--------------------------------------------

             Summary: [freemarker-cli] Proof Of Concept for providing DataFrames
                 Key: FREEMARKER-144
                 URL: https://issues.apache.org/jira/browse/FREEMARKER-144
             Project: Apache Freemarker
          Issue Type: Task
            Reporter: Siegfried Goeschl


Sometime the user need to massage tabular data coming from CSV or an Excel sheet, eg.. joining on columns

* There is some ad-hoc code in the CSV tool
* I had a look at available DataFrame libraries (see https://medium.com/@thijser/doing-cool-data-science-in-java-how-3-dataframe-libraries-stack-up-5e6ccb7b437)

I finally found [nRo/DataFrame|https://github.com/nRo/DataFrame] and it would make a good fit

* Comes with MIT licence
* Depends only on `antlr4-runtime` and `slf4j`
* It's API would fit nicely into a FreeMarker Template
* It provides a DataFrame implementation and some basic transformations
* It currently does not support temporal column types

What I would like to implement is

* Reading CSV & Excel into a DataFrame
* Write a DataFrame to CSV








--
This message was sent by Atlassian Jira
(v8.3.4#803005)